OptionalallowOptionalcontentOptionalfinalOptional number of 0x00 bytes inserted after the padding delimiter in the final record. Usually 0 for Web Push.
OptionalgcmOptionalheadersOptionalrsRFC8188 record size (rs) in octets (ciphertext record size).
Must be >= 18.
OptionaltopicOptionalTTLOptionalurgencyOptionalvapid
RFC8188 compliance knob:
falseby default.trueonly if you intentionally want multi-record RFC8188 payload bodies.